Am I correct that the first one can only be used with older MBP such as MBP 2010 17" while the second one can only be used for rMBP?

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- So far as concerns MacBook Pros, yes. The first one fits all non-Retina MacBook Pros and also all pre-2015 MacBooks and all pre-2012 MacBook Airs. The second one fits all Retina MacBook Pros and also all post-2011 MacBook Airs.

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